Compilare: user.cpp: In function ‘void Build_graph()’: user.cpp:71:9: warning: unused variable ‘pus’ [-Wunused-variable] int pus = 0; ^ user.cpp: In function ‘void Solve()’: user.cpp:110:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!maxed && pz2 < t1.size()){ ^ user.cpp: In function ‘void Read()’: user.cpp:21:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&M); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp: In function ‘int main()’: user.cpp:121:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in","r",stdin); ^ user.cpp:122:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.out","w",stdout); ^